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Using a ImageChart in GWT

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Hi, in first place, hi everyone, I hope I can get some useful info from what I post here at, at the same time, if I'm able to help people with their programming problems I'll be happy to do so.

I want to use a ImageChart in GWT so I can later transform it into a image file but I've tried this two ways and I don't see any other possible way.

1st way via javascript:

In file imagen.js I've the following:

But I get an error that constructor new google.visualization.ImageChart(document.getElementById('line_div')); is not valid, I wonder how can this be if I put this code in an html file it works perfectly, but whatever...

2nd way

Doing this I get the following error:
@com.google.gwt.visualization.client.visualizations.ImageChart::createJso(Lcom/google/gwt/dom/client/Element;)([JavaScript object(262)]): $wnd.google.visualization.ImageChart is not a constructor

I know the data is different for each, but what's important is to get the image file, data doesn't mean anything right now.

So, I'm stuck with this.

If you can also point me out about how to do the transformation to an image file, I'd be very grateful, but first this is necessary in order to achieve that.

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